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From: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
To: Roland McGrath <roland@redhat.com>
Cc: Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] notify_parent and ptrace cleanup
Date: Thu, 26 Aug 2004 06:45:35 +0900	[thread overview]
Message-ID: <87hdqqlwn4.fsf@devron.myhome.or.jp> (raw)
In-Reply-To: <200408252107.i7PL7XWw017681@magilla.sf.frob.com>

> > SIGKILL _already_ doesn't actually wake up a ptraced task. It just informs 
> > the tracer, last I looked.

I'm thinking the following issue here,

For example,

ptraced task stopping:

   in get_signal_to_deliver(),
	set_current_state(TASK_STOPPED);
	spin_unlock_irq(&current->sighand->siglock);
	notify_parent(current, SIGCHLD);
	schedule();

in here, root want to kill those tasks,

   kill -> ... -> specific_send_sig_info -> signal_wake_up(t, sig == SIGKILL)

   in signal_wake_up(),
	mask = TASK_INTERRUPTIBLE;
	if (resume)
		mask |= TASK_STOPPED;
	if (!wake_up_state(t, mask))


Hmm.. I may be missing something...?
-- 
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>

  reply	other threads:[~2004-08-25 21:50 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-08-18  0:40 [PATCH] notify_parent cleanup Roland McGrath
2004-08-18  6:44 ` Andrew Morton
2004-08-21  1:09   ` [PATCH] notify_parent and ptrace cleanup Roland McGrath
2004-08-21 11:47     ` OGAWA Hirofumi
2004-08-25  2:43       ` Roland McGrath
2004-08-25 17:51         ` OGAWA Hirofumi
2004-08-25 18:08           ` Roland McGrath
2004-08-25 19:48             ` OGAWA Hirofumi
2004-08-25 19:54               ` Linus Torvalds
2004-08-25 20:20                 ` Roland McGrath
2004-08-25 20:53                   ` OGAWA Hirofumi
2004-08-25 21:02                     ` Linus Torvalds
2004-08-25 21:07                       ` Roland McGrath
2004-08-25 21:45                         ` OGAWA Hirofumi [this message]
2004-08-19  4:26 ` [PATCH] notify_parent cleanup OGAWA Hirofumi
2004-08-19 20:59   ` Roland McGrath
2004-08-19 22:01     ` OGAWA Hirofumi
2004-08-19 22:04       ` Roland McGrath

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